Use of vitamin D supplements during pregnancy is safe and effective for healthy women says a new study. Even at the highest dosage vitamin D was found to have no adverse effects in such women or their newborns. The team led by Bruce Hollis from the Medical University of South Carolina used a randomized trial with healthy expectant mothers to discover how varying dosages of daily supplements could safely sustain a circulating vitamin D level. 'Vitamin D supplementation during pregnancy remains controversial largely due to severe misconceptions about the potential harm it may cause to the foetus' said Hollis reports